Inbred rice line 053001

ABSTRACT

An inbred rice line designated 053001 is disclosed. The invention relates to the seeds of rice line 053001, to the plants of rice line 053001 and to methods for producing a rice plant produced by crossing the inbred rice line 053001 with itself or another rice line. The invention further relates to hybrid rice seeds and plants produced by crossing the inbred rice line 053001 with another rice line.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinctive inbred rice line,designated 053001. All publications cited in this application are hereinincorporated by reference.

Rice is an ancient agricultural crop and is today one of the principalfood crops of the world. There are two cultivated species of rice: Oryzasativa L., the Asian rice, and Oryza glaberrima Steud., the Africanrice. The Asian species constitutes virtually all of the world'scultivated rice and is the species grown in the United States. Threemajor rice producing regions exist in the United States: the MississippiDelta (Arkansas, Mississippi, northeast Louisiana, southeast Missouri),the Gulf Coast (southwest Louisiana, southeast Texas), and the CentralValleys of California.

Rice production in the United States can be broadly categorized aseither dry-seeded or water-seeded. In the dry-seeded system, rice issown into a well-prepared seed bed with a grain drill or by broadcastingthe seed and incorporating it with a disk or harrow. Moisture for seedgermination is from irrigation or rainfall. Another method of plantingby the dry-seeded system is to broadcast the seed by airplane into aflooded field, then promptly drain the water from the field. For thedry-seeded system, when the plants have reached sufficient size (four-to five-leaf stage), a shallow permanent flood of water 5 to 16 cm deepis applied to the field until the rice approaches maturity. Rice isgrown on flooded soils to optimize grain yields. Heavy clay soils orsilt loam soils with hard pan layers about 30 cm below the surface aretypical rice-producing soils because they minimize water losses due topercolation.

In the water-seeded system, rice seed is soaked for 12 to 36 hours toinitiate germination, and the seed is broadcast by airplane into ashallow-flooded field. Water may be drained from the field for a shortperiod of time to enhance seedling establishment or the seedlings may beallowed to emerge through the shallow flood. In either case, a shallowflood is maintained until the rice approaches maturity. For both thedry-seeded and water-seeded production systems, the rice is harvestedwith large combines 2 to 3 weeks after draining.

Rice in the United States is classified into three primary market typesby grain size and shape as: long-grain, medium grain and short-grain.Typical U.S. long-grain rice cooks dry and fluffy when steamed orboiled, whereas medium- and short-grain rice cooks moist and sticky.Long-grain cultivars have been traditionally grown in the southernstates and generally receive higher market prices.

Although specific breeding objectives vary somewhat in the differentregions, increasing yield is a primary objective in all programs. Grainyield of rice is determined by the number of panicles per unit area, thenumber of fertile florets per panicle, and grain weight per fertilefloret. Increases in any or all of these yield components provide amechanism to obtain higher yields. Heritable variation exists for all ofthese components, and breeders may directly or indirectly select forincreases in any of them.

There are numerous steps in the development of any novel, desirablecultivar. Plant breeding begins with the analysis and definition ofproblems and weaknesses of the current cultivars, followed by theestablishment of program goals, and the definition of specific breedingobjectives. The next step is selection of parental lines that possessthe traits required to meet the program goals. The goal is to combine ina single cultivar an improved combination of desirable traits from theparental sources. These important traits may include higher yield,resistance to diseases and insects, better stems and roots, tolerance tolow temperatures, better agronomic characteristics, and grain quality.

The goal of rice plant breeding is to develop new, unique and superiorrice cultivars and hybrids. The breeder initially selects and crossestwo or more parental lines, followed by selection among the many newgenetic combinations. The breeder can theoretically generate billions ofnew and different genetic combinations via crossing. The breeder has nodirect control at the cellular level; therefore, two breeders will neverdevelop the same line, or even very similar lines, having the same ricetraits.

Choice of breeding methods to select for the improved combination oftraits depends on the mode of plant reproduction, the heritability ofthe trait being improved, and the type of cultivar used commercially(e.g., F₁ hybrid cultivar, pureline cultivar, etc.). For highlyheritable traits, a choice of superior individual plants evaluated at asingle location will be effective, whereas for traits with lowheritability, selection should be based on mean values obtained fromreplicated evaluations of families of related plants. Popular selectionmethods include pedigree selection, backcross selection, and single seedselection, or a combination of these methods.

Pedigree breeding is used commonly for the improvement ofself-pollinating crops such as rice. Two parents which possessfavorable, complementary traits are crossed to produce an F₁. An F₂population is produced by selfing one or several F₁s. Selection of thebest individuals may begin in the F₂ population; then, beginning in theF₃, the best individuals in the best families are selected. Replicatedtesting of families can begin in the F₄ generation to improve theeffectiveness of selection for traits with low heritability. At anadvanced stage of inbreeding (i.e., F₆ and F₇), the best lines ormixtures of phenotypically similar lines are tested for potentialrelease as new parental lines.

Mass and recurrent selections can be used to improve populations ofeither self- or cross-pollinating crops. A genetically variablepopulation of heterozygous individuals is either identified or createdby intercrossing several different parents. The best plants are selectedbased on individual superiority, outstanding progeny, or excellentcombining ability. The selected plants are intercrossed to produce a newpopulation in which further cycles of selection are continued.

Backcross breeding has been used to transfer genes for a simplyinherited, highly heritable trait into a desirable homozygous cultivaror inbred line which is the recurrent parent. The source of the trait tobe transferred is called the donor parent. The resulting plant isexpected to have the attributes of the recurrent parent (e.g., cultivar)and the desirable trait transferred from the donor parent. After theinitial cross, individuals possessing the phenotype of the donor parentare selected and repeatedly crossed (backcrossed) to the recurrentparent.

The single-seed descent procedure in the strict sense refers to plantinga segregating population, harvesting a sample of one seed per plant, andusing the one-seed sample to plant the next generation. When thepopulation has been advanced from the F₂ to the desired level ofinbreeding, the plants from which lines are derived will each trace todifferent F₂ individuals. The number of plants in a population declineseach generation due to failure of some seeds to germinate or some plantsto produce at least one seed. As a result, not all of the F₂ plantsoriginally sampled in the population will be represented by a progenywhen generation advance is completed.

In a multiple-seed procedure, rice breeders commonly harvest one or moreseeds from each plant in a population and thresh them together to form abulk. Part of the bulk is used to plant the next generation and part isput in reserve. The procedure has been referred to as modifiedsingle-seed descent or the pod-bulk technique.

The multiple-seed procedure has been used to save labor at harvest. Itis considerably faster to thresh panicles with a machine than to removeone seed from each by hand for the single-seed procedure. Themultiple-seed procedure also makes it possible to plant the same numberof seeds of a population each generation of inbreeding. Enough seeds areharvested to make up for those plants that did not germinate or produceseed.

Descriptions of other breeding methods that are commonly used fordifferent traits and crops can be found in one of several referencebooks (e.g., Allard, R. W. et al. Principles of Plant Breeding (1999);Agrawal, R. L. Fundamentals of Plant Breeding and Hybrid Seed Production(1998); Schlegel, R. H. J. Encyclopedic Dictionary of plant Breeding andRelated Subjects (2003); Fehr, W. R. et al. Principles of CultivarDevelopment—Theory and Technique (1987)).

Each breeding program should include a periodic, objective evaluation ofthe efficiency of the breeding procedure. Evaluation criteria varydepending on the goal and objectives, but should include gain fromselection per year based on comparisons to an appropriate standard,overall value of the advanced breeding lines, and number of successfulcultivars produced per unit of input (e.g., per year, per dollarexpended, etc.).

Promising advanced breeding lines are thoroughly tested and compared toappropriate standards in environments representative of the commercialtarget area(s) for at least three or more years. The best lines arecandidates for new commercial cultivars; those still deficient in a fewtraits may be used as parents to produce new populations for furtherselection.

These processes, which lead to the final step of marketing anddistribution, usually take from 8 to 12 years from the time the firstcross is made and may rely on the development of improved breeding linesas precursors. Therefore, development of new cultivars is atime-consuming process that requires precise forward planning, efficientuse of resources, and a minimum of changes in direction.

A most difficult task is the identification of individuals that aregenetically superior, because for most traits the true genotypic valueis masked by other confounding plant traits or environmental factors.One method of identifying a superior plant is to observe its performancerelative to other experimental plants and to a widely grown standardcultivar. If a single observation is inconclusive, replicatedobservations provide a better estimate of its genetic worth.

Each breeding cycle, the plant breeder selects the germplasm to advanceto the next generation. This germplasm is grown under unique anddifferent geographical, climatic and soil conditions, and furtherselections are then made, throughout the growing season. The cultivarswhich are developed are unpredictable. This unpredictability is becausethe breeder's selection occurs in unique environments, with no controlat the DNA level (using conventional breeding procedures), and withmillions of different possible genetic combinations being generated. Abreeder of ordinary skill in the art cannot predict the final resultinglines he develops, except possibly in a very gross and general fashion.The same breeder cannot produce the same cultivar twice by using theexact same original parents and the same selection techniques. Thisunpredictability results in the expenditure of large amounts of researchmonies to develop superior new rice cultivars.

Proper testing should detect any major faults and establish the level ofsuperiority or improvement over current cultivars. In addition toshowing superior performance, there must be a demand for a new cultivarthat is compatible with industry standards or which creates a newmarket. The introduction of a new cultivar will incur additional coststo the seed producer, the grower, processor and consumer; for specialadvertising and marketing, altered seed and commercial productionpractices, and new product utilization. The testing preceding release ofa new cultivar should take into consideration research and developmentcosts as well as technical superiority of the final cultivar. Forseed-propagated cultivars, it must be feasible to produce seed easilyand economically.

Rice, Oryza sativa L., is an important and valuable field crop. Thus, acontinuing goal of plant breeders is to develop stable, high yieldingrice cultivars that are agronomically sound. The reasons for this goalare obviously to maximize the amount of grain produced on the land usedand to supply food for both animals and humans. To accomplish this goal,the rice breeder must select and develop rice plants that have thetraits that result in superior cultivars.

The foregoing examples of the related art and limitations relatedtherewith are intended to be illustrative and not exclusive. Otherlimitations of the related are will become apparent to those of skill inthe art upon a reading of the specification.

SUMMARY OF THE INVENTION

The following embodiments and aspects thereof are described inconjunction with systems, tools and methods which are meant to beexemplary and illustrative, no limiting in scope. In variousembodiments, one or more of the above described problems have beenreduced or eliminated, while other embodiments are directed to otherimprovements.

According to the invention, there is provided a novel inbred rice linedesignated 053001. This invention thus relates to the seeds of inbredrice line 053001, to the plants of inbred rice line 053001 and tomethods for producing a rice plant produced by crossing inbred rice line053001 with itself or another rice line.

Thus, any such methods using inbred rice line 053001 are part of thisinvention: selfing, backcrosses, hybrid production, crosses topopulations, and the like. All plants produced using rice line 053001 asa parent are within the scope of this invention. Advantageously, therice line could be used in crosses with other, different, rice plants toproduce first generation (F₁) rice hybrid seeds and plants with superiorcharacteristics.

In another aspect, the present invention provides for single geneconverted plants of 053001. The single transferred gene may preferablybe a dominant or recessive allele. Preferably, the single transferredgene will confer such traits as herbicide resistance, insect resistance,resistance to bacterial, fungal, or viral diseases, male fertility, malesterility, enhanced nutritional quality, and industrial usage. Thesingle gene may be a naturally occurring rice gene or a transgeneintroduced through genetic engineering techniques.

In another aspect, the present invention provides regenerable cells foruse in tissue culture of rice plant 053001. The tissue culture willpreferably be capable of regenerating plants having the physiologicaland morphological characteristics of the foregoing rice plant, and ofregenerating plants having substantially the same genotype as theforegoing rice plant. Preferably, the regenerable cells in such tissuecultures will be embryos, protoplasts, meristematic cells, callus,pollen, leaves, anthers, root tips, flowers, seeds, panicles or stems.Still further, the present invention provides rice plants regeneratedfrom the tissue cultures of the invention.

In addition to the exemplary aspects and embodiments described above,further aspects and embodiments will become apparent by study of thefollowing descriptions.

DEFINITIONS

In the description and tables which follow, a number of terms are used.In order to provide a clear and consistent understanding of thespecification and claims, including the scope to be given such terms,the following definitions are provided:

Alkali Spreading Value. Indicator of gelatinization temperature and anindex that measures the extent of disintegration of milled rice kernelin contact with dilute alkali solution. Standard long grains have 3 to 5Alkali Spreading Value (intermediate gelatinization temperature).

Allele. An allele is any of one or more alternative forms of a gene, allof which relate to one trait or characteristic. In a diploid cell ororganism, the two alleles of a given gene occupy corresponding loci on apair of homologous chromosomes.

Apparent Amylose Percent. The most important grain characteristic thatdescribes cooking behavior in each grain class, or type, i.e., long,medium and short grain. It is the amount of amylose in the endospermstarch of milled rice that can be detected using the iodine bindingmethod. Generally standard long grains contain 19 to 23% amylose.Rexmont type long grains contain 24 to 25% amylose. Short and mediumgrains contain 16 to 19% amylose. Waxy rice contains 0% amylose. Amylosevalues will vary over environments.

Backcrossing. Backcrossing is a process in which a breeder repeatedlycrosses hybrid progeny back to one of the parents, for example, a firstgeneration hybrid F₁ with one of the parental genotypes of the F₁hybrid.

Breakdown. The peak viscosity minus the trough viscosity.

Chalk. An opaque region of the rice kernel due to loose packing of thestarch granules. Chalk may occur throughout or in a part of the kernel.

Consistency. Final viscosity minus trough viscosity.

Days to 50% heading. Average number of days from emergence to the daywhen 50% of all panicles are exerted at least partially through the leafsheath. A measure of maturity.

Essentially all the physiological and morphological characteristics. Aplant having essentially all the physiological and morphologicalcharacteristics means a plant having the physiological and morphologicalcharacteristics of the line, except for the characteristics derived fromthe converted gene.

Final Viscosity. The viscosity measure of rice flour/water slurry afterbeing heated to 95° C. and uniformly cooled to 50° C. (AmericanAssociation of Cereal Chemists). Values less than 200 for cool pasteindicate softer cooking types of rice.

Gelatinization temperature. The temperature at which a definedflour-water mixture exhibits a measurable viscosity increase under astandardized, instrument-specific cooking cycle (also known as “initialviscosity increase temperature”).

Grain Length (L). Length of a rice grain is measured in millimeters.

Grain Width (W). Width of a rice grain is measured in millimeters.

Grain Yield. Grain yield is measured in kilograms per hectare and at12.0% moisture. Grain yield of rice is determined by the number ofpanicles per unit area, the number of fertile florets per panicle, andgrain weight per floret.

Harvest Moisture. The percent of moisture of the grain when harvested.

Length/Width (L/W) Ratio. This ratio is determined by dividing theaverage length (L) by the average width (W).

Lodging Percent. Lodging is measured as a subjective rating and is apercentage of the plant stems leaning or fallen completely to the groundbefore harvest.

1000 Grain Wt. The weight of 1000 rice grains as measured in grams.

Paste Temperature (also called Initial Viscosity Increase Temperature).The temperature at which a defined flour-water mixture exhibits ameasurable viscosity increase under a standardized, instrument-specific(RAPID VISCO Analyzer) cooking cycle.

Paste Time. The time at which a defined flour-water mixture exhibits ameasurable viscosity increase under a standardized, instrument-specific(RAPID VISCO Analyzer) cooking cycle.

Peak Temperature at Peak Viscosity. The temperature at which peak hotpaste viscosity is attained.

Peak Time. The time at which peak (maximum) hot-paste viscosity isattained during a standardized, instrument-specific (RAPID VISCOAnalyzer) cooking cycle.

Plant Height. Plant height in centimeters is taken from soil surface tothe tip of the extended panicle at harvest.

Peak Viscosity. The maximum viscosity attained during heating when astandardized instrument-specific protocol is applied to a defined riceflour-water slurry.

Quantitative Trait Loci (QTL). Quantitative trait loci (QTL) refer togenetic loci that control to some degree numerically representabletraits that are usually continuously distributed.

RVA Viscosity. RAPID VISCO Analyzer (RVA) is a widely used laboratoryinstrument to examine paste viscosity, or thickening ability of milledrice during the cooking process.

Regeneration. Regeneration refers to the development of a plant fromtissue culture.

Setback. Setback is the final viscosity minus trough viscosity.

Single Gene Converted (Conversion). Single gene converted (conversion)plant refers to plants which are developed by a plant breeding techniquecalled backcrossing wherein essentially all of the desired morphologicaland physiological characteristics of a line are recovered in addition tothe single gene transferred into the line via the backcrossing techniqueor via genetic engineering.

Total Milling (also call Milling Yield). The quantity of total milledrice produced in the milling of rough rice to a well-milled degree; itis usually expressed as a percent of rough rice by weight, but whenspecified, may be expressed as a percent of brown rice.

Trough (also known as hot-paste viscosity). The viscosity measure ofrice flour/water slurry after being heated to 95° C. Lower valuesindicate softer and stickier cooking types of rice.

Trough Time. The time at which the Trough (hot-paste viscosity) occurswhen a defined flour-water mixture has been heated to and held at themaximum temperature of a standardized, instrument-specific (RAPID VISCOAnalyzer) cooking cycle.

Trough Viscosity. The minimum viscosity after the peak, normallyoccurring when the sample starts to cool.

Whole Milling (also called Head Rice Milling Yield). The quantity ofmilled head (¾-whole) rice produced in the milling of rough rice to awell-milled degree, usually expressed in the United States as a percentof rough rice by weight.

DETAILED DESCRIPTION OF THE INVENTION

Inbred rice line 053001 is a short, very early-maturing line that wasevaluated from 1997 to 2002. Inbred rice line 053001 was tested at fourlocations from 2002 to 2005 against a broad set of public varieties andpotential parent lines.

The line has shown uniformity and stability as described in thefollowing inbred line description information. It has beenself-pollinated a sufficient number of generations with carefulattention to uniformity of plant type. The line has been increased withcontinued observation for uniformity.

Inbred rice line 053001 has the following morphologic and othercharacteristics (based primarily on data collected at Alvin, Tex.).TABLE 1 INBRED LINE DESCRIPTION INFORMATION Maturity (Alvin, Texas at150 kg/ha N) Days to maturity: 74 days from emergence to 50% headingMaturity Class: Very early (70-85 days) Culm (Degrees from perpendicularafter flowering) Angle: Erect (less than 30°) Length: 98 cm (Soil levelto top of extended panicle on main stem) Height Class: Short InternodeColor Green (After flowering): Lodging Index: 0 - Very strong Flag Leaf(After Heading) Length: 35 cm Width: 1.5 cm Pubescence: Glabrous LeafAngle (After heading): Intermediate Blade Color: Green Basal Leaf SheathColor: Purple lines Ligule Length: 17 cm Color (Late vegetative state):White Shape: Cleft Collar Color (Late Pale Green vegetative stage):Auricle Color (Late Pale green vegetative stage): Panicle Length: 23 cmType: Intermediate Secondary Branching: Light Exsertion (near maturity):91-99% Axis: Droopy Shattering: Very low (<1%) Threshability:Intermediate Grain (Spikelet) Awns (After full heading): Absent ApiculusColor (At maturity): Purple Stigma Color: Light purple Lemma and PaleaStraw Color (At maturity): Lemma and Palea Glabrous Pubescence: SpikeletSterility (At Highly fertile (>90%) maturity): Grain (Seed) Seed CoatColor: Light Brown Endosperm Type: Nonglutinous (nonwaxy) EndospermTranslucency: Clear Endosperm Chalkiness: 10 (percentage of grains withmore than 20% of chalkiness) Scent: Nonscented Shape Class (Length/widthLong ratio): Measurements: 1000 Length Width L/W Grains (mm) (mm) Ratio(grams) Milled 7.01 2.04 3.44 25 Milling Yield (% whole 62% kernel(head) rice to rough rice): Brokens: 7.7% Apparent Amylose: 20.4% AlkaliSpreading value: 3.7 (1.5% KOH Solution) Amylographic Paste Viscosity(RAPID VISCO Amylograph AACC Method - RVU) Peak Viscosity 436.90 PeakTime 9.35 Trough 184.1 Trough Time 13.42 Paste Temperature 75.30 PasteTime 5.57 Final Viscosity 323.75 Breakdown 252.75 Setback −113Consistency 139.58 Disease Resistance Rice Blast (Pyricularia OverallResistance = Highly Resistant oryzae): (evaluations were conducted basedon inoculations made with a mix of the most predominant P. oryzaepathotypes (IC-17, IE-1K, IG-1, IH-1 and IB-1) found in the southern USrice growing area Straight Head: Resistant Sheath Blight (RhizoctoniaSusceptible solani):

This invention also is directed to methods for producing a rice plant bycrossing a first parent rice plant with a second parent rice plantwherein either the first or second parent rice plant is a rice plant ofthe line 053001. Further, both first and second parent rice plants cancome from the rice line 053001. Still further, this invention also isdirected to methods for producing an inbred rice line 053001-derivedrice plant by crossing rice line 053001 with a second rice plant andgrowing the progeny seed, and repeating the crossing and growing stepswith the rice line 053001-derived plant from 0 to 7 times. Thus, anysuch methods using rice line 053001 are part of this invention: selfing,backcrosses, hybrid production, crosses to populations, and the like.All plants produced using rice line 053001 as a parent are within thescope of this invention, including plants derived from rice line 053001.Advantageously, this inbred rice line is used in crosses with other,different, rice lines to produce first generation (F₁) rice seeds andplants with superior characteristics.

It should be understood that the inbred line can, through routinemanipulation of cytoplasmic or other factors, be produced in amale-sterile form. Such embodiments are also contemplated within thescope of the present claims.

As used herein, the term plant includes plant cells, plant protoplasts,plant cell tissue cultures from which rice plants can be regenerated,plant calli, plant clumps and plant cells that are intact in plants orparts of plants, such as embryos, pollen, ovules, flowers, glumes,panicles, leaves, stems, roots, root tips, anthers, pistils and thelike.

Further Embodiments of the Invention

With the advent of molecular biological techniques that have allowed theisolation and characterization of genes that encode specific proteinproducts, scientists in the field of plant biology developed a stronginterest in engineering the genome of plants to contain and expressforeign genes, or additional, or modified versions of native, orendogenous, genes (perhaps driven by different promoters) in order toalter the traits of a plant in a specific manner. Such foreignadditional and/or modified genes are referred to herein collectively as“transgenes”. Over the last fifteen to twenty years, several methods forproducing transgenic plants have been developed, and the presentinvention, in particular embodiments, also relates to transformedversions of the claimed inbred line.

Culture for expressing desired structural genes and cultured cells areknown in the art. Also as known in the art, rice is transformable andregenerable such that whole plants containing and expressing desiredgenes under regulatory control may be obtained. General descriptions ofplant expression vectors and reporter genes and transformation protocolscan be found in Gruber, et al., “Vectors for Plant Transformation, inMethods in Plant Molecular Biology & Biotechnology” in Glich, et al.,(Eds. pp. 89-119, CRC Press, 1993). Moreover GUS expression vectors andGUS gene cassettes are available from Clone Tech Laboratories, Inc.,Palo Alto, Calif. while luciferase expression vectors and luciferasegene cassettes are available from Pro Mega Corp. (Madison, Wis.).General methods of culturing plant tissues are provided for example byMaki, et al., “Procedures for Introducing Foreign DNA into Plants” inMethods in Plant Molecular Biology & Biotechnology, Glich, et al., (Eds.pp. 67-88 CRC Press, 1993); and by Phillips, et al., “Cell-TissueCulture and In-Vitro Manipulation” in Corn & Corn Improvement, 3rdEdition; Sprague, et al., (Eds. pp. 345-387) American Society ofAgronomy Inc., 1988. Methods of introducing expression vectors intoplant tissue include the direct infection or co-cultivation of plantcells with Agrobacterium tumefaciens, Horsch et al., Science, 227:1229(1985). Descriptions of Agrobacterium vector systems and methods forAgrobacterium-mediated gene transfer provided by Gruber, et al., supra.

Useful methods include but are not limited to expression vectorsintroduced into plant tissues using a direct gene transfer method suchas microprojectile-mediated delivery, DNA injection, electroporation andthe like. More preferably expression vectors are introduced into planttissues using a microprojectile media delivery system with a biolisticdevice or using Agrobacterium-mediated transformation. Transformantplants obtained with the protoplasm of the invention are intended to bewithin the scope of this invention.

Plant transformation involves the construction of an expression vectorwhich will function in plant cells. Such a vector comprises DNAcomprising a gene under control of or operatively linked to a regulatoryelement (for example, a promoter). The expression vector may contain oneor more such operably linked gene/regulatory element combinations. Thevector(s) may be in the form of a plasmid, and can be used alone or incombination with other plasmids, to provide transformed rice plants,using transformation methods as described below to incorporatetransgenes into the genetic material of the rice plant(s).

Expression Vectors for Transformation: Marker Genes

Expression vectors include at least one genetic marker, operably linkedto a regulatory element (a promoter, for example) that allowstransformed cells containing the marker to be either recovered bynegative selection, i.e., inhibiting growth of cells that do not containthe selectable marker gene, or by positive selection, i.e., screeningfor the product encoded by the genetic marker. Many commonly usedselectable marker genes for plant transformation are well known in thetransformation arts, and include, for example, genes that code forenzymes that metabolically detoxify a selective chemical agent which maybe an antibiotic or an herbicide, or genes that encode an altered targetwhich is insensitive to the inhibitor. A few positive selection methodsare also known in the art.

One commonly used selectable marker gene for plant transformation is theneomycin phosphotransferase II (nptII) gene, isolated from transposonTn5, which when placed under the control of plant regulatory signalsconfers resistance to kanamycin. Fraley et al., Proc. Natl. Acad. Sci.U.S.A., 80:4803 (1983). Another commonly used selectable marker gene isthe hygromycin phosphotransferase gene which confers resistance to theantibiotic hygromycin. Vanden Elzen et al., Plant Mol. Biol., 5:299(1985).

Additional selectable marker genes of bacterial origin that conferresistance to antibiotics include gentamycin acetyl transferase,streptomycin phosphotransferase, and aminoglycoside-3′-adenyltransferase, the bleomycin resistance determinant. Hayford et al., PlantPhysiol. 86:1216 (1988); Jones et al., Mol. Gen. Genet., 210:86 (1987);Svab et al., Plant Mol. Biol. 14:197 (1990); Hille et al., Plant Mol.Biol. 7:171 (1986). Other selectable marker genes confer resistance toherbicides such as glyphosate, glufosinate or bromoxynil. Comai et al.,Nature 317:741-744 (1985), Gordon-Kamm et al., Plant Cell 2:603-618(1990) and Stalker et al., Science 242:419-423 (1988).

Selectable marker genes for plant transformation not of bacterial origininclude, for example, mouse dihydrofolate reductase, plant5-enolpyruvylshikimate-3-phosphate synthase and plant acetolactatesynthase. Eichholtz et al., Somatic Cell Mol. Genet. 13:67 (1987), Shahet al., Science 233:478 (1986), Charest et al., Plant Cell Rep. 8:643(1990).

Another class of marker genes for plant transformation requiresscreening of presumptively transformed plant cells rather than directgenetic selection of transformed cells for resistance to a toxicsubstance such as an antibiotic. These genes are particularly useful toquantify or visualize the spatial pattern of expression of a gene inspecific tissues and are frequently referred to as reporter genesbecause they can be fused to a gene or gene regulatory sequence for theinvestigation of gene expression. Commonly used genes for screeningpresumptively transformed cells include β-glucuronidase (GUS),β-galactosidase, luciferase and chloramphenicol acetyltransferase.Jefferson, R. A., Plant Mol. Biol. Rep. 5:387 (1987), Teeri et al., EMBOJ. 8:343 (1989), Koncz et al., Proc. Natl. Acad. Sci U.S.A. 84:131(1987), DeBlock et al., EMBO J. 3:1681 (1984). Another approach to theidentification of relatively rare transformation events has been use ofa gene that encodes a dominant constitutive regulator of the Zea maysanthocyanin pigmentation pathway. Ludwig et al., Science 247:449 (1990).

In vivo methods for visualizing GUS activity that do not requiredestruction of plant tissue are available. Molecular Probes publication2908, IMAGENE GREEN, p. 1-4 (1993) and Naleway et al., J. Cell Biol.115:151a (1991). However, these in vivo methods for visualizing GUSactivity have not proven useful for recovery of transformed cellsbecause of low sensitivity, high fluorescent backgrounds and limitationsassociated with the use of luciferase genes as selectable markers.

More recently, a gene encoding Green Fluorescent Protein (GFP) has beenutilized as a marker for gene expression in prokaryotic and eukaryoticcells. Chalfie et al., Science 263:802 (1994). GFP and mutants of GFPmay be used as screenable markers.

Expression Vectors for Transformation: Promoters

Genes included in expression vectors must be driven by nucleotidesequence comprising a regulatory element, for example, a promoter.Several types of promoters are now well known in the transformationarts, as are other regulatory elements that can be used alone or incombination with promoters.

As used herein, “promoter” includes reference to a region of DNAupstream from the start of transcription and involved in recognition andbinding of RNA polymerase and other proteins to initiate transcription.A “plant promoter” is a promoter capable of initiating transcription inplant cells. Examples of promoters under developmental control includepromoters that preferentially initiate transcription in certain tissues,such as leaves, roots, seeds, fibers, xylem vessels, tracheids, orsclerenchyma. Such promoters are referred to as “tissue-preferred”.Promoters which initiate transcription only in certain tissue arereferred to as “tissue-specific”. A “cell type” specific promoterprimarily drives expression in certain cell types in one or more organs,for example, vascular cells in roots or leaves. An “inducible” promoteris a promoter which is under environmental control. Examples ofenvironmental conditions that may effect transcription by induciblepromoters include anaerobic conditions or the presence of light.Tissue-specific, tissue-preferred, cell type specific, and induciblepromoters constitute the class of “non-constitutive” promoters. A“constitutive” promoter is a promoter which is active under mostenvironmental conditions.

A. Inducible Promoters—An inducible promoter is operably linked to agene for expression in rice. Optionally, the inducible promoter isoperably linked to a nucleotide sequence encoding a signal sequencewhich is operably linked to a gene for expression in rice. With aninducible promoter the rate of transcription increases in response to aninducing agent.

Any inducible promoter can be used in the instant invention. See Ward etal., Plant Mol. Biol. 22:361-366 (1993). Exemplary inducible promotersinclude, but are not limited to, that from the ACEI system whichresponds to copper (Meft et al., PNAS 90:4567-4571 (1993)); In2 genefrom maize which responds to benzenesulfonamide herbicide safeners(Hershey et al., Mol. Gen Genetics 227:229-237 (1991) and Gatz et al.,Mol. Gen. Genetics 243:32-38 (1994)) or Tet repressor from Tn10 (Gatz etal., Mol. Gen. Genetics 227:229-237 (1991)). A particularly preferredinducible promoter is a promoter that responds to an inducing agent towhich plants do not normally respond. An exemplary inducible promoter isthe inducible promoter from a steroid hormone gene, the transcriptionalactivity of which is induced by a glucocorticosteroid hormone (Schena etal., Proc. Natl. Acad. Sci. U.S.A. 88:0421 (1991)).

B. Constitutive Promoters—A constitutive promoter is operably linked toa gene for expression in rice or the constitutive promoter is operablylinked to a nucleotide sequence encoding a signal sequence which isoperably linked to a gene for expression in rice.

Many different constitutive promoters can be utilized in the instantinvention. Exemplary constitutive promoters include, but are not limitedto, the promoters from plant viruses such as the 35S promoter from CaMV(Odell et al., Nature 313:810-812 (1985)) and the promoters from suchgenes as rice actin (McElroy et al., Plant Cell 2:163-171 (1990));ubiquitin (Christensen et al., Plant Mol. Biol. 12:619-632 (1989) andChristensen et al., Plant Mol. Biol. 18:675-689 (1992)); pEMU (Last etal., Theor. Appl. Genet. 81:581-588 (1991)); MAS (Velten et al., EMBO J.3:2723-2730 (1984)) and maize H3 histone (Lepetit et al., Mol. Gen.Genetics 231:276-285 (1992) and Atanassova et al., Plant Journal 2 (3):291-300 (1992)).

The ALS promoter, Xba1/Ncol fragment 5′ to the Brassica napus ALS3structural gene (or a nucleotide sequence similarity to said Xba1/Ncolfragment), represents a particularly useful constitutive promoter. SeePCT application WO96/30530.

C. Tissue-specific or Tissue-preferred Promoters—A tissue-specificpromoter is operably linked to a gene for expression in rice.Optionally, the tissue-specific promoter is operably linked to anucleotide sequence encoding a signal sequence which is operably linkedto a gene for expression in rice. Plants transformed with a gene ofinterest operably linked to a tissue-specific promoter produce theprotein product of the transgene exclusively, or preferentially, in aspecific tissue.

Any tissue-specific or tissue-preferred promoter can be utilized in theinstant invention. Exemplary tissue-specific or tissue-preferredpromoters include, but are not limited to, a root-preferred promoter,such as that from the phaseolin gene (Murai et al., Science 23:476-482(1983) and Sengupta-Gopalan et al., Proc. Natl. Acad. Sci. U.S.A.82:3320-3324 (1985)); a leaf-specific and light-induced promoter such asthat from cab or rubisco (Simpson et al., EMBO J. 4(11):2723-2729 (1985)and Timko et al., Nature 318:579-582 (1985)); an anther-specificpromoter such as that from LAT52 (Twell et al., Mol. Gen. Genetics217:240-245 (1989)); a pollen-specific promoter such as that from Zm13(Guerrero et al., Mol. Gen. Genetics 244:161-168 (1993)) or amicrospore-preferred promoter such as that from apg (Twell et al., Sex.Plant Reprod. 6:217-224 (1993)).

Signal Sequences for Targeting Proteins to Subcellular Compartments

Transport of protein produced by transgenes to a subcellular compartmentsuch as the chloroplast, vacuole, peroxisome, glyoxysome, cell wall ormitochondrion or for secretion into the apoplast, is accomplished bymeans of operably linking the nucleotide sequence encoding a signalsequence to the 5′ and/or 3′ region of a gene encoding the protein ofinterest. Targeting sequences at the 5′ and/or 3′ end of the structuralgene may determine, during protein synthesis and processing, where theencoded protein is ultimately compartmentalized.

The presence of a signal sequence directs a polypeptide to either anintracellular organelle or subcellular compartment or for secretion tothe apoplast. Many signal sequences are known in the art. See, forexample Becker et al., Plant Mol. Biol. 20:49 (1992); Close, P. S.,Master's Thesis, Iowa State University (1993); Knox, C., et al., PlantMol. Biol. 9:3-17 (1987); Lerner et al., Plant Physiol. 91:124-129(1989); Fontes et al., Plant Cell 3:483-496 (1991); Matsuoka et al.,Proc. Natl. Acad. Sci. 88:834 (1991); Gould et al., J. Cell. Biol.108:1657 (1989); Creissen et al., Plant J. 2:129 (1991); Kalderon, etal., Cell 39:499-509 (1984); Steifel, et al., Plant Cell 2:785-793(1990).

Foreign Protein Genes and Agronomic Genes

With transgenic plants according to the present invention, a foreignprotein can be produced in commercial quantities. Thus, techniques forthe selection and propagation of transformed plants, which are wellunderstood in the art, yield a plurality of transgenic plants which areharvested in a conventional manner, and a foreign protein then can beextracted from a tissue of interest or from total biomass. Proteinextraction from plant biomass can be accomplished by known methods whichare discussed, for example, by Heney and Orr, Anal. Biochem. 114:92-6(1981).

According to a preferred embodiment, the transgenic plant provided forcommercial production of foreign protein is rice. In another preferredembodiment, the biomass of interest is seed. For the relatively smallnumber of transgenic plants that show higher levels of expression, agenetic map can be generated, primarily via conventional RFLP, PCR andSSR analysis, which identifies the approximate chromosomal location ofthe integrated DNA molecule. For exemplary methodologies in this regard,see Glick and Thompson, Methods in Plant Molecular Biology andBiotechnology, CRC Press, Boca Raton 269:284 (1993). Map informationconcerning chromosomal location is useful for proprietary protection ofa subject transgenic plant. If unauthorized propagation is undertakenand crosses made with other germplasm, the map of the integration regioncan be compared to similar maps for suspect plants, to determine if thelatter have a common parentage with the subject plant. Map comparisonswould involve hybridizations, RFLP, PCR, SSR and sequencing, all ofwhich are conventional techniques.

Likewise, by means of the present invention, agronomic genes can beexpressed in transformed plants. More particularly, plants can begenetically engineered to express various phenotypes of agronomicinterest. Exemplary genes implicated in this regard include, but are notlimited to, those categorized below:

1. Genes That Confer Resistance to Pests or Disease and That Encode:

A. Plant disease resistance genes. Plant defenses are often activated byspecific interaction between the product of a disease resistance gene(R) in the plant and the product of a corresponding avirulence (Avr)gene in the pathogen. A plant cultivar can be transformed with clonedresistance gene to engineer plants that are resistant to specificpathogen strains. See, for example Jones et al., Science 266:789 (1994)(cloning of the tomato Cf-9 gene for resistance to Cladosporium fulvum);Martin et al., Science 262:1432 (1993) (tomato Pto gene for resistanceto Pseudomonas syringae pv. tomato encodes a protein kinase); Mindrinoset al., Cell 78:1089 (1994) (Arabidopsis RSP2 gene for resistance toPseudomonas syringae).

B. A Bacillus thuringiensis protein, a derivative thereof or a syntheticpolypeptide modeled thereon. See, for example, Geiser et al., Gene48:109 (1986), who disclose the cloning and nucleotide sequence of a Btδ-endotoxin gene. Moreover, DNA molecules encoding δ-endotoxin genes canbe purchased from American Type Culture Collection, Manassas, Virginia,for example, under ATCC Accession Nos. 40098, 67136, 31995 and 31998.

C. A lectin. See, for example, the disclosure by Van Damme et al., PlantMolec. Biol. 24:25 (1994), who disclose the nucleotide sequences ofseveral Clivia miniata mannose-binding lectin genes.

D. A vitamin-binding protein such as avidin. See PCT applicationUS93/06487. The application teaches the use of avidin and avidinhomologs as larvicides against insect pests.

E. An enzyme inhibitor, for example, a protease or proteinase inhibitoror an amylase inhibitor. See, for example, Abe et al., J. Biol. Chem.262:16793 (1987) (nucleotide sequence of rice cysteine proteinaseinhibitor), Huub et al., Plant Molec. Biol. 21:985 (1993) (nucleotidesequence of cDNA encoding tobacco proteinase inhibitor I), Sumitani etal., Biosci. Biotech. Biochem. 57:1243 (1993) (nucleotide sequence ofStreptomyces nitrosporeus α-amylase inhibitor).

F. An insect-specific hormone or pheromone such as an ecdysteroid andjuvenile hormone, a variant thereof, a mimetic based thereon, or anantagonist or agonist thereof. See, for example, the disclosure byHammock et al., Nature 344:458 (1990), of baculovirus expression ofcloned juvenile hormone esterase, an inactivator of juvenile hormone.

G. An insect-specific peptide or neuropeptide which, upon expression,disrupts the physiology of the affected pest. For example, see thedisclosures of Regan, J. Biol. Chem. 269:9 (1994) (expression cloningyields DNA coding for insect diuretic hormone receptor), and Pratt etal., Biochem. Biophys. Res. Comm. 163:1243 (1989) (an allostatin isidentified in Diploptera puntata). See also U.S. Pat. No. 5,266,317 toTomalski et al., who disclose genes encoding insect-specific, paralyticneurotoxins.

H. An insect-specific venom produced in nature by a snake, a wasp, etc.For example, see Pang et al., Gene 116:165 (1992), for disclosure ofheterologous expression in plants of a gene coding for a scorpioninsectotoxic peptide.

I. An enzyme responsible for a hyper-accumulation of a monoterpene, asesquiterpene, a steroid, a hydroxamic acid, a phenylpropanoidderivative or another non-protein molecule with insecticidal activity.

J. An enzyme involved in the modification, including thepost-translational modification, of a biologically active molecule; forexample, a glycolytic enzyme, a proteolytic enzyme, a lipolytic enzyme,a nuclease, a cyclase, a transaminase, an esterase, a hydrolase, aphosphatase, a kinase, a phosphorylase, a polymerase, an elastase, achitinase and a glucanase, whether natural or synthetic. See PCTapplication WO 93/02197 in the name of Scott et al., which discloses thenucleotide sequence of a callase gene. DNA molecules which containchitinase-encoding sequences can be obtained, for example, from the ATCCunder Accession Nos. 39637 and 67152. See also Kramer et al., InsectBiochem. Molec. Biol. 23:691 (1993), who teach the nucleotide sequenceof a cDNA encoding tobacco hornworm chitinase, and Kawalleck et al.,Plant Molec. Biol. 21:673 (1993), who provide the nucleotide sequence ofthe parsley ubi4-2 polyubiquitin gene.

K. A molecule that stimulates signal transduction. For example, see thedisclosure by Botella et al., Plant Molec. Biol. 24:757 (1994), ofnucleotide sequences for mung bean calmodulin cDNA clones, and Griess etal., Plant Physiol. 104:1467 (1994), who provide the nucleotide sequenceof a maize calmodulin cDNA clone.

L. A hydrophobic moment peptide. See PCT application WO95/16776(disclosure of peptide derivatives of Tachyplesin which inhibit fungalplant pathogens) and PCT application WO95/18855 (teaches syntheticantimicrobial peptides that confer disease resistance), the respectivecontents of which are hereby incorporated by reference.

M. A membrane permease, a channel former or a channel blocker. Forexample, see the disclosure of Jaynes et al., Plant Sci 89:43 (1993), ofheterologous expression of a cecropin-β, lytic peptide analog to rendertransgenic tobacco plants resistant to Pseudomonas solanacearum.

N. A viral-invasive protein or a complex toxin derived therefrom. Forexample, the accumulation of viral coat proteins in transformed plantcells imparts resistance to viral infection and/or disease developmenteffected by the virus from which the coat protein gene is derived, aswell as by related viruses. See Beachy et al., Ann. Rev. Phytopathol.28:451 (1990). Coat protein-mediated resistance has been conferred upontransformed plants against alfalfa mosaic virus, cucumber mosaic virus,tobacco streak virus, potato virus X, potato virus Y, tobacco etchvirus, tobacco rattle virus and tobacco mosaic virus. Id.

O. An insect-specific antibody or an immunotoxin derived therefrom.Thus, an antibody targeted to a critical metabolic function in theinsect gut would inactivate an affected enzyme, killing the insect. Cf.Taylor et al., Abstract #497, Seventh Int'l Symposium on MolecularPlant-Microbe Interactions (Edinburgh, Scotland) (1994) (enzymaticinactivation in transgenic tobacco via production of single-chainantibody fragments).

P. A virus-specific antibody. See, for example, Tavladoraki et al.,Nature 366:469 (1993), who show that transgenic plants expressingrecombinant antibody genes are protected from virus attack.

Q. A developmental-arrestive protein produced in nature by a pathogen ora parasite. Thus, fungal endo-α-1,4-D-polygalacturonases facilitatefungal colonization and plant nutrient release by solubilizing plantcell wall homo-α-1,4-D-galacturonase. See Lamb et al., Bio/Technology10:1436 (1992). The cloning and characterization of a gene which encodesa bean endopolygalacturonase-inhibiting protein is described by Toubartet al., Plant J. 2:367 (1992).

R. A developmental-arrestive protein produced in nature by a plant. Forexample, Logemann et al., Bio/Technology 10:305 (1992), have shown thattransgenic plants expressing the barley ribosome-inactivating gene havean increased resistance to fungal disease.

2. Genes That Confer Resistance to an Herbicide, for Example:

A. An herbicide that inhibits the growing point or meristem, such as animidazolinone or a sulfonylurea. Exemplary genes in this category codefor mutant ALS and AHAS enzyme as described, for example, by Lee et al.,EMBO J. 7:1241 (1988), and Miki et al., Theor. Appl. Genet 80:449(1990), respectively.

B. Glyphosate (resistance conferred by mutant5-enolpyruvlishikimate-3-phosphate synthase (EPSP) and aroA genes,respectively) and other phosphono compounds such as glufosinate(phosphinothricin acetyl transferase (PAT) and Streptomyceshygroscopicus PAT, bar, genes), and pyridinoxy or phenoxy propionicacids and cyclohexones (ACCase inhibitor-encoding genes). See, forexample, U.S. Pat. No. 4,940,835 to Shah, et al., which discloses thenucleotide sequence of a form of EPSP which can confer glyphosateresistance. A DNA molecule encoding a mutant aroA gene can be obtainedunder ATCC accession number 39256, and the nucleotide sequence of themutant gene is disclosed in U.S. Pat. No. 4,769,061 to Comai. Europeanpatent application No. 0 333 033 to Kumada et al., and U.S. Pat. No.4,975,374 to Goodman et al., disclose nucleotide sequences of glutaminesynthetase genes which confer resistance to herbicides such asL-phosphinothricin. The nucleotide sequence of a PAT gene is provided inEuropean application No. 0 242 246 to Leemans et al. DeGreef et al.,Bio/Technology 7:61 (1989), describe the production of transgenic plantsthat express chimeric bar genes coding for PAT activity. Exemplary ofgenes conferring resistance to phenoxy propionic acids and cyclohexones,such as sethoxydim and haloxyfop are the Acc1-S1, Acc1-S2 and Acc1-S3genes described by Marshall et al., Theor. Appl. Genet. 83:435 (1992).

C. An herbicide that inhibits photosynthesis, such as a triazine (psbAand gs+ genes) or a benzonitrile (nitrilase gene). Przibilla et al.,Plant Cell 3:169 (1991), describe the transformation of Chlamydomonaswith plasmids encoding mutant psbA genes. Nucleotide sequences fornitrilase genes are disclosed in U.S. Pat. No. 4,810,648 to Stalker, andDNA molecules containing these genes are available under ATCC AccessionNos. 53435, 67441, and 67442. Cloning and expression of DNA coding for aglutathione S-transferase is described by Hayes et al., Biochem. J.285:173 (1992).

3. Genes That Confer or Contribute to a Value-Added Trait, Such as:

A. Modified fatty acid metabolism, for example, by transforming a plantwith an antisense gene of stearyl-ACP desaturase to increase stearicacid content of the plant. See Knultzon et al., Proc. Natl. Acad. Sci.U.S.A. 89:2624 (1992).

B. Decreased phytate content, 1) Introduction of a phytase-encoding genewould enhance breakdown of phytate, adding more free phosphate to thetransformed plant. For example, see Van Hartingsveldt et al., Gene127:87 (1993), for a disclosure of the nucleotide sequence of anAspergillus niger phytase gene; 2) A gene could be introduced thatreduced phytate content. In maize, this, for example, could beaccomplished, by cloning and then reintroducing DNA associated with thesingle allele which is responsible for maize mutants characterized bylow levels of phytic acid. See Raboy et al., Maydica 35:383 (1990).

C. Modified carbohydrate composition effected, for example, bytransforming plants with a gene coding for an enzyme that alters thebranching pattern of starch. See Shiroza et al., J. Bacteol. 170:810(1988) (nucleotide sequence of Streptococcus mutantsfructosyltransferase gene), Steinmetz et al., Mol. Gen. Genet. 20:220(1985) (nucleotide sequence of Bacillus subtilis levansucrase gene), Penet al., Bio/Technology 10:292 (1992) (production of transgenic plantsthat express Bacillus lichenifonnis α-amylase), Elliot et al., PlantMolec. Biol. 21:515 (1993) (nucleotide sequences of tomato invertasegenes), Søgaard et al., J. Biol. Chem. 268:22480 (1993) (site-directedmutagenesis of barley α-amylase gene), and Fisher et al., Plant Physiol.102:1045 (1993) (maize endosperm starch branching enzyme II).

Methods for Transformation

Numerous methods for plant transformation have been developed, includingbiological and physical, plant transformation protocols. See, forexample, Miki et al., “Procedures for Introducing Foreign DNA intoPlants” in Methods in Plant Molecular Biology and Biotechnology, GlickB. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages67-88. In addition, expression vectors and in vitro culture methods forplant cell or tissue transformation and regeneration of plants areavailable. See, for example, Gruber et al., “Vectors for PlantTransformation” in Methods in Plant Molecular Biology and Biotechnology,Glick B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993)pages 89-119.

A. Agrobacterium-mediated Transformation—One method for introducing anexpression vector into plants is based on the natural transformationsystem of Agrobacterium. See, for example, Horsch et al., Science227:1229 (1985). A. tumefaciens and A. rhizogenes are plant pathogenicsoil bacteria which genetically transform plant cells. The Ti and Riplasmids of A. tumefaciens and A. rhizogenes, respectively, carry genesresponsible for genetic transformation of the plant. See, for example,Kado, C. I., Crit. Rev. Plant Sci. 10:1 (1991). Descriptions ofAgrobacterium vector systems and methods for Agrobacterium-mediated genetransfer are provided by Gruber et al., supra, Miki et al., supra, andMoloney et al., Plant Cell Reports 8:238 (1989). See also, U.S. Pat. No.5,591,616 issued Jan. 7, 1997.

B. Direct Gene Transfer—Despite the fact the host range forAgrobacterium-mediated transformation is broad, some major cereal cropspecies and gymnosperms have generally been recalcitrant to this mode ofgene transfer, even though some success has recently been achieved inrice and corn. Hiei et al., The Plant Journal 6:271-282 (1994) and U.S.Pat. No. 5,591,616 issued January 7, 1997. Several methods of planttransformation, collectively referred to as direct gene transfer, havebeen developed as an alternative to Agrobacterium-mediatedtransformation.

A generally applicable method of plant transformation ismicroprojectile-mediated transformation wherein DNA is carried on thesurface of microprojectiles measuring 1 to 4 μm. The expression vectoris introduced into plant tissues with a biolistic device thataccelerates the microprojectiles to speeds of 300 to 600 m/s which issufficient to penetrate plant cell walls and membranes. Sanford et al.,Part. Sci. Technol. 5:27 (1987), Sanford, J. C., Trends Biotech. 6:299(1988), Klein et al., Bio/Technology 6:559-563 (1988), Sanford, J. C.,Physiol Plant 7:206 (1990), Klein et al., Biotechnology 10:268 (1992).In rice, several target tissues can be bombarded with DNA-coatedmicroprojectiles in order to produce transgenic plants, including, forexample, callus (Type I or Type II), immature embryos, and meristematictissue.

Another method for physical delivery of DNA to plants is sonication oftarget cells. Zhang et al., Bio/Technology 9:996 (1991). Additionally,liposome and spheroplast fusion have been used to introduce expressionvectors into plants. Deshayes et al., EMBO J., 4:2731 (1985), Christouet al., Proc Natl. Acad. Sci. U.S.A. 84:3962 (1987). Direct uptake ofDNA into protoplasts using CaCl₂ precipitation, polyvinyl alcohol orpoly-L-ornithine has also been reported. Hain et al., Mol. Gen. Genet.199:161 (1985) and Draper et al., Plant Cell Physiol. 23:451 (1982).Electroporation of protoplasts and whole cells and tissues have alsobeen described. Donn et al., In Abstracts of VIIth InternationalCongress on Plant Cell and Tissue Culture IAPTC, A2-38, p 53 (1990);D'Halluin et al., Plant Cell 4:1495-1505 (1992) and Spencer et al.,Plant Mol. Biol. 24:51-61 (1994).

Following transformation of rice target tissues, expression of theabove-described selectable marker genes allows for preferentialselection of transformed cells, tissues and/or plants, usingregeneration and selection methods now well known in the art.

The foregoing methods for transformation would typically be used forproducing a transgenic line. The transgenic line could be crossed, withanother (non-transformed or transformed) line, in order to produce a newtransgenic line. Alternatively, a genetic trait which has beenengineered into a particular rice line using the foregoingtransformation techniques could be moved into another rice line usingtraditional backcrossing techniques that are well known in the plantbreeding arts. For example, a backcrossing approach could be used tomove an engineered trait from a public, non-elite line into an eliteline, or from a line containing a foreign gene in its genome into a linewhich does not contain that gene. As used herein, “crossing” can referto a simple X by Y cross, or the process of backcrossing, depending onthe context.

Single Gene Conversion

When the term rice plant is used in the context of the presentinvention, this also includes any single gene conversions of that inbredline. The term single gene converted plant as used herein refers tothose rice plants which are developed by a plant breeding techniquecalled backcrossing wherein essentially all of the desired morphologicaland physiological characteristics of a line are recovered in addition tothe single gene transferred into the line via the backcrossingtechnique. Backcrossing methods can be used with the present inventionto improve or introduce a characteristic into the line. The termbackcrossing as used herein refers to the repeated crossing of a hybridprogeny back to one of the parental rice plants, the recurrent parent,for that line, i.e., backcrossing 1, 2, 3, 4, 5, 6, 7, 8, 9 or moretimes to the recurrent parent. The parental rice plant which contributesthe gene for the desired characteristic is termed the nonrecurrent ordonor parent. This terminology refers to the fact that the nonrecurrentparent is used one time in the backcross protocol and therefore does notrecur. The parental rice plant to which the gene or genes from thenonrecurrent parent are transferred is known as the recurrent parent asit is used for several rounds in the backcrossing protocol ((Jennings,P. R. et al. Rice Improvement (1979); Mackill D. On your mark, get,select. Rice Today, July-September pp 28-29 (2004); Fehr, W. R. et al.Principles of Cultivar Development—Theory and Technique (1987)).

In a typical backcross protocol, the original line of interest(recurrent parent) is crossed to a second line (nonrecurrent parent)that carries the single gene of interest to be transferred. Theresulting progeny from this cross are then crossed again to therecurrent parent and the process is repeated until a rice plant isobtained wherein essentially all of the desired morphological andphysiological characteristics of the recurrent parent are recovered inthe converted plant, in addition to the single transferred gene from thenonrecurrent parent as determined at the 5% significance level whengrown in the same environmental conditions.

The selection of a suitable recurrent parent is an important step for asuccessful backcrossing procedure. The goal of a backcross protocol isto alter or substitute a single trait or characteristic in the originalinbred line. To accomplish this, a single gene of the recurrent line ismodified or substituted with the desired gene from the nonrecurrentparent, while retaining essentially all of the rest of the desiredgenetic, and therefore the desired physiological and morphological,constitution of the original line. The choice of the particularnonrecurrent parent will depend on the purpose of the backcross; one ofthe major purposes is to add some commercially desirable, agronomicallyimportant trait to the plant. The exact backcrossing protocol willdepend on the characteristic or trait being altered to determine anappropriate testing protocol. Although backcrossing methods aresimplified when the characteristic being transferred is a dominantallele, a recessive allele may also be transferred. In this instance itmay be necessary to introduce a test of the progeny to determine if thedesired characteristic has been successfully transferred.

Many single gene traits have been identified that are not regularlyselected for in the development of a new inbred line but that can beimproved by backcrossing techniques. Single gene traits may or may notbe transgenic, examples of these traits include but are not limited to,male sterility, waxy starch, herbicide resistance, resistance forbacterial, fungal, or viral disease, insect resistance, male fertility,enhanced nutritional quality, industrial usage, yield stability andyield enhancement. These genes are generally inherited through thenucleus. Some known exceptions to this are the genes for male sterility,some of which are inherited cytoplasmically, but still act as singlegene traits. Several of these single gene traits are described in U.S.Pat. Nos. 5,777,196; 5,948,957 and 5,969,212, the disclosures of whichare specifically hereby incorporated by reference.

Tissue Culture

Further reproduction of the line can occur by tissue culture andregeneration. Tissue culture of various tissues of rice and regenerationof plants therefrom is well known and widely published. For example,reference may be had to Komatsuda, T. et al., Crop Sci. 31:333-337(1991); Stephens, P. A., et al., Theor. Appl. Genet. (1991) 82:633-635;Komatsuda, T. et al., Plant Cell, Tissue and Organ Culture, 28:103-113(1992); Dhir, S. et al., Plant Cell Reports (1992) 11:285-289; Pandey,P. et al., Japan J. Breed. 42:1-5 (1992); and Shetty, K., et al., PlantScience 81:245-251 (1992); as well as U.S. Pat. No. 5,024,944 issuedJun. 18, 1991 to Collins et al., and U.S. Pat. No. 5,008,200 issued Apr.16, 1991 to Ranch et al. Thus, another aspect of this invention is toprovide cells which upon growth and differentiation produce rice plantshaving the physiological and morphological characteristics of rice line053001.

As used herein, the term “tissue culture” indicates a compositioncomprising isolated cells of the same or a different type or acollection of such cells organized into parts of a plant. Exemplarytypes of tissue cultures are protoplasts, calli, plant clumps, and plantcells that can generate tissue culture that are intact in plants orparts of plants, such as embryos, pollen, flowers, seeds, glumes,panicles, leaves, stems, roots, root tips, anthers, and the like. Meansfor preparing and maintaining plant tissue culture are well known in theart. By way of example, a tissue culture comprising organs has been usedto produce regenerated plants. U.S. Pat. Nos. 5,959,185; 5,973,234 and5,977,445 describe certain techniques, the disclosures of which areincorporated herein by reference.

As used herein, the term “plant” includes plant cells, plantprotoplasts, plant cells of tissue culture from which rice plants can beregenerated, plant calli, plant clumps, and plant cells that are intactin plants or parts of plants, such as pollen, flowers, embryos, ovules,seeds, glumes, panicles, leaves, stems, pistils, anthers and the like.Thus, another aspect of this invention is to provide for cells whichupon growth and differentiation produce an inbred line havingessentially all of the physiological and morphological characteristicsof 053001.

The present invention contemplates a rice plant regenerated from atissue culture of a line (e.g., 053001) or hybrid plant of the presentinvention. As is well known in the art, tissue culture of rice can beused for the in vitro regeneration of a rice plant. Tissue culture ofvarious tissues of rice and regeneration of plants therefrom is wellknown and widely published. For example, reference may be had to Chu, Q.R., et al., (1999) “Use of bridging parents with high antherculturability to improve plant regeneration and breeding value in rice”,Rice Biotechnology Quarterly 38:25-26; Chu, Q. R., et al., (1998), “Anovel plant regeneration medium for rice anther culture of Southern U.S.crosses”, Rice Biotechnology Quarterly 35:15-16; Chu, Q. R., et al.,(1997), “A novel basal medium for embryogenic callus induction ofSouthern US crosses”, Rice Biotechnology Quarterly 32:19-20; and Oono,K., “Broadening the Genetic Variability By Tissue Culture Methods”, Jap.J. Breed. 33 (Suppl.2), 306-307, illus. 1983. Thus, another aspect ofthis invention is to provide cells which upon growth and differentiationproduce rice plants having the physiological and morphologicalcharacteristics of line 053001.

Duncan, et al., Planta 165:322-332 (1985) reflects that 97% of theplants cultured that produced callus were capable of plant regeneration.Subsequent experiments with both cultivars and hybrids produced 91%regenerable callus that produced plants. In a further study in 1988,Songstad, et al., Plant Cell Reports 7:262-265 (1988), reports severalmedia additions that enhance regenerability of callus of two cultivars.Other published reports also indicated that “non-traditional” tissuesare capable of producing somatic embryogenesis and plant regeneration.K. P. Rao et al., Maize Genetics Cooperation Newsletter, 60:64-65(1986), refers to somatic embryogenesis from glume callus cultures andB. V. Conger, et al., Plant Cell Reports, 6:345-347 (1987) indicatessomatic embryogenesis from the tissue cultures of corn leaf segments.Thus, it is clear from the literature that the state of the art is suchthat these methods of obtaining plants are conventional in the sensethat they are routinely used and have a very high rate of success.

Tissue culture of corn is described in European Patent Application,publication 160,390. Corn tissue culture procedures are also describedin Green and Rhodes, “Plant Regeneration in Tissue Culture of Maize”,Maize for Biological Research (Plant Molecular Biology Association,Charlottesville, Va. 367-372, (1982)) and in Duncan et al., “TheProduction of Callus Capable of Plant Regeneration from Immature Embryosof Numerous Zea Mays Genotypes,” 165 Planta 322:332 (1985). Thus,another aspect of this invention is to provide cells which upon growthand differentiation produce rice plants having the physiological andmorphological characteristics of inbred rice line 053001.

Additional Breeding Methods

The utility of inbred rice line 053001 also extends to crosses withother species. Commonly, suitable species will be of the familyGraminaceae, and especially of the genera Zea, Tripsacum, Croix,Schlerachne, Polytoca, Chionachne, and Trilobachne, of the tribeMaydeae.

This invention also is directed to methods for producing a rice plant bycrossing a first parent rice plant with a second parent rice plantwherein the first or second parent rice plant is a rice plant of theinbred rice line 053001. Further, both first and second parent riceplants can come from the inbred rice line 053001. Thus, any such methodsusing the inbred rice line 053001 are part of this invention: selfing,backcrosses, hybrid production, crosses to populations, and the like.All plants produced using inbred rice line 053001 as a parent are withinthe scope of this invention, including those developed from varietiesderived from inbred rice line 053001. Advantageously, the rice linecould be used in crosses with other, different, rice plants to producefirst generation (F₁) rice hybrid seeds and plants with superiorcharacteristics. The rice line of the invention can also be used fortransformation where exogenous genes are introduced and expressed by theinbred line of the invention. Genetic variants created either throughtraditional breeding methods using inbred rice line 053001 or throughtransformation of line 053001 by any of a number of protocols known tothose of skill in the art are intended to be within the scope of thisinvention.

The following describes breeding methods that may be used with inbredrice line 053001 in the development of further rice plants. One suchembodiment is a method for developing an inbred rice line 053001 progenyrice plant in a rice plant breeding program comprising: obtaining therice plant, or a part thereof, of line 053001 utilizing said plant orplant part as a source of breeding material and selecting a 053001progeny plant with molecular markers in common with line 053001 and/orwith morphological and/or physiological characteristics selected fromthe characteristics listed in Tables 1, 2 or 3. Breeding steps that maybe used in the rice plant breeding program include pedigree breeding,back crossing, mutation breeding, and recurrent selection. Inconjunction with these steps, techniques such as RFLP-enhancedselection, genetic marker enhanced selection (for example SSR markers)and the making of double haploids may be utilized.

Another method involves producing a population of inbred rice line053001 progeny rice plants, comprising crossing line 053001 with anotherrice plant, thereby producing a population of rice plants, which, onaverage, derive 50% of their alleles from rice line 053001. A plant ofthis population may be selected and repeatedly selfed or sibbed with arice line resulting from these successive filial generations. Oneembodiment of this invention is the rice line produced by this methodand that has obtained at least 50% of its alleles from inbred rice line053001.

One of ordinary skill in the art of plant breeding would know how toevaluate the traits of two plant varieties to determine if there is nosignificant difference between the two traits expressed by thosevarieties. For example, see Fehr and Walt, Principles of CultivarDevelopment, p 261-286 (1987). Thus the invention includes inbred riceline 053001 progeny rice plants comprising a combination of at least tworice line 053001 traits selected from the group consisting of thoselisted in Tables 1, 2, and 3 or the rice line 053001 combination oftraits listed in the Summary of the Invention, so that said progeny riceplant is not significantly different for said traits than rice line053001. Using techniques described herein, molecular markers may be usedto identify said progeny plant as a rice line 053001 progeny plant. Meantrait values may be used to determine whether trait differences aresignificant, and preferably the traits are measured on plants grownunder the same environmental conditions. Once such a variety isdeveloped its value is substantial since it is important to advance thegermplasm base as a whole in order to maintain or improve traits such asyield, disease resistance, pest resistance, and plant performance inextreme environmental conditions.

Progeny of rice line 053001 may also be characterized through theirfilial relationship with rice line 053001, as for example, being withina certain number of breeding crosses of rice line 053001. A breedingcross is a cross made to introduce new genetics into the progeny, and isdistinguished from a cross, such as a self or a sib cross, made toselect among existing genetic alleles. The lower the number of breedingcrosses in the pedigree, the closer the relationship between rice line053001 and its progeny. For example, progeny produced by the methodsdescribed herein may be within 1, 2, 3, 4 or 5 breeding crosses of riceline 053001.

The seed of inbred rice line 053001, the plant produced from the inbredrice line seed, the hybrid rice plant produced from the crossing of theinbred line, hybrid seed, and various parts of the hybrid rice plant andtransgenic versions of the foregoing, can be utilized for human food,livestock feed, and as a raw material in industry.

Tables

In the tables below, yield and other agronomic characteristics of inbredrice line 053001 and hybrids produced using inbred rice line 053001 as aparent are compared with those of rice line Cocodrie, a rice linecommonly grown in the United States. In the following tables,probability figures indicate the probability associated with a pairedStudent's t-Test used to determine whether two samples are likely tohave come from the same two underlying populations that have the samemean.

As shown in Table 2 below, the rough rice grain yield and total millingare lower for inbred rice line 053001 than they are for Cocodrie,however, the height, lodging and whole milling are similar. Inbred riceline 053001 flowers, on average two days later than line Cocodrie. Datawere collected over four years.

In Table 2 below, column 2 gives the yield for each line in kilogramsper hectare; column 3 shows the height in centimeters for the varieties;column 4 shows the days to 50% flowering; column 5 shows the lodgingpercent, column 6 gives the total milling percent and column 7 shows thewhole milling percent. The number of different locations over which thedata were collected is shown in row 3. TABLE 2 Plant Days to YieldHeight 50% Total Whole (kg/ha) (cm) Flowering Lodging % Milling %Milling % 053001 9,083 94 82 0 70.0 62.0 Cocodrie 10,463 95 80 0 71.462.6 Locations (#) 15 13 14 0 14 14 Difference −1,380 −1 2 0 −1.3 −0.6Probability 0.000 0.366 0.004 0.000 0.220

Table 3 below shows the quality comparisons between inbred rice line053001 and Cocodrie. Rice line 053001 is significantly different fromCocodrie in all quality traits other than ASV and chalk. Rice line053001 has lower amylose, and has a higher grain length to width ratiothan Cocodrie. Rice line 053001 has similar gelatinization temperatures(ASV) and chalk values to Cocodrie. The data were collected over fouryears.

In Table 3 below, column 2 shows the amylose, column 3 shows alkalispreading value, column 4 shows the grain length, column 5 shows thegrain width, column 6 shows the grain length to width ratio and column 7shows the chalk percent. The number of different locations over whichthe data were collected is shown in row 3. TABLE 3 L/W Amylose ASVLength Width Ratio Chalk % 053001 21.2 4.1 6.94 2.02 3.44 10 Cocodrie23.3 3.9 6.76 2.13 3.18 14 Locations (#) 10 10 9 9 9 8 Difference −2.10.2 0.18 −0.11 0.26 −4 Probability 0.001 0.129 0.004 0.001 0.000 0.238

As shown in Table 4 below, when inbred rice line 053001 is used as aparent to produce a rice hybrid, the yield, plant height and totalmilling percentage increase as compared to line Cocodrie, but the wholemilling percent is lower than that of Cocodrie. Lodging percent issimilar for both hybrids. Data were collected over four years.

In Table 4 below, column 2 shows the yield in kilograms per hectare;column 3 shows the height in centimeters for the varieties; column 4shows the days to 50% flowering; column 5 shows the lodging percent,column 6 gives the total milling percent and column 7 shows the wholemilling percent. The number of different locations over which the datawere collected is shown in row 3. TABLE 4 Plant Yield Height Days to 50%Total Whole (kg/ha) (cm) Flowering Lodging % Milling % Milling %054001*053001 12,228 109 77 41 71.2 59.2 Cocodrie 9,769 93 80 34 70.961.7 Locations (#) 302 177 196 20 242 242 Difference 2,460 16 −3 73 0.2−2.5 Probability 0.000 0.000 0.000 0.125 0.003 0.000

As shown in Table 5 below, when inbred rice line 053001 is used as aparent to produce a rice hybrid, the quality characteristics of thegrain are different from those of cultivar Cocodrie. The rice hybridproduced from the cross of inbred rice lines 053001 and 054001 has loweramylose and lower alkali spreading value than line Cocodrie, butincreased grain length, grain width, grain length to width ratio andchalk percent than Cocodrie. Data were collected over four years.

In Table 5 below, column 2 shows the amylose, column 3 shows alkalispreading value, column 4 shows the grain length, column 5 shows thegrain width, column 6 shows the grain length to width ratio and column 7shows the chalk percent. The number of different locations over whichthe data were collected is shown in row 3. TABLE 5 Amylose ASV LengthWidth L/W Ratio Chalk % 054001*053001 19.8 3.6 6.96 2.18 3.20 20Cocodrie 23.8 3.9 6.78 2.13 3.19 16 Locations (#) 123 117 130 130 130111 Difference −4.0 −0.4 0.18 0.05 0.01 4 Probability 0.000 0.000 0.0000.000 0.025 0.000

As shown in Table 6 below, when inbred rice line 053001 is used as aparent in a second combination to produce a rice hybrid, the yield,plant height and lodging percent are increased as compared to lineCocodrie while the total milling percent is similar to that of Cocodrie.This second combination is two days earlier and has a lower wholemilling percentage than that of Cocodrie. Data were collected over fouryears.

In Table 6 below, column 2 shows the yield in kilograms per hectare;column 3 shows the height in centimeters for the varieties; column 4shows the days to 50% flowering; column 5 shows the lodging percent,column 6 gives the total milling percent and column 7 shows the wholemilling percent. The number of different locations over which the datawere collected is shown in row 3. TABLE 6 Plant Yield Height Days to 50%Total Whole (kg/ha) (cm) Flowering Lodging % Milling % Milling %054002*053001 12,988 111 76 38 70.2 57.7 Cocodrie 9,640 95 78 18 70.360.9 Locations (#) 89 38 50 15 76 76 Difference 3,348 16 −2 70 −0.2 −3.2Probability 0.000 0.000 0.000 0.004 0.259 0.000

As shown in Table 7 below, when inbred rice line 053001 is used as aparent in a second combination to produce a rice hybrid, the qualitycharacteristics of the grain are different from those of line Cocodrie,differing mainly in amylose, grain length, grain width and chalkpercent. Data were collected over four years.

In Table 7 below, column 2 shows the amylose, column 3 shows alkalispreading value, column 4 shows the grain length, column 5 shows thegrain width, column 6 shows the grain length to width ratio and column 7shows the chalk percent. The number of different locations over whichthe data were collected is shown in row 3. TABLE 7 Amylose ASV LengthWidth L/W Ratio Chalk % 054002*053001 20.0 3.9 6.84 2.19 3.12 18Cocodrie 23.8 4.0 6.77 2.13 3.17 15 Locations (#) 25 29 37 37 37 32Difference −3.8 −0.1 0.07 0.06 −0.05 4 Probability 0.000 0.140 0.0000.000 0.000 0.025

As shown in Table 8 below, when inbred rice line 053001 is used as aparent in a third combination to produce a rice hybrid, the yield andplant height are increased as compared to line Cocodrie while the totalmilling percent and lodging percentage do not show significantdifferences between cultivars. Whole milling percent and days to 50%flowering are reduced for the hybrid compared to Cocodrie. Data werecollected over two years.

In Table 8 below, column 2 shows the yield in kilograms per hectare;column 3 shows the height in centimeters for the varieties; column 4shows the days to 50% flowering; column 5 shows the lodging percent,column 6 gives the total milling percent and column 7 shows the wholemilling percent. The number of different locations over which the datawere collected is shown in row 3. TABLE 8 Plant Yield Height Days to 50%Total Whole (kg/ha) (cm) Flowering Lodging % Milling % Milling %054003*053001 12,676 112 79 64 70.9 55.9 Cocodrie 9,647 95 81 35 71.061.7 Locations (#) 38 17 18 4 37 37 Difference 3,029 18 −2 79 −0.1 −5.8Probability 0.000 0.000 0.000 0.180 0.317 0.000

As shown in Table 9 below, when inbred rice line 053001 is used as aparent in a third combination to produce a rice hybrid, the qualitycharacteristics of the grain are different from those of inbred riceline Cocodrie. With the exception of amylose, the hybrid has highervalues than Cocodrie for the other characteristics described. Data werecollected over two years.

In Table 9 below, column 2 shows the amylose, column 3 shows alkalispreading value, column 4 shows the grain length, column 5 shows thegrain width, column 6 shows the grain length to width ratio and column 7shows the chalk percent. The number of different locations over whichthe data were collected is shown in row 3. TABLE 9 Amylose ASV LengthWidth L/W Ratio Chalk % 054003*053001 23.7 4.6 7.13 2.17 3.29 26Cocodrie 24.0 4.1 6.75 2.12 3.18 11 Locations (#) 16 18 15 15 15 14Difference −0.3 0.5 0.38 0.04 0.11 15 Probability 0.038 0.003 0.0000.004 0.000 0.000

One of the most important criteria for selecting parental lines is theirSpecific Combining Ability (SCA). Table 10 shows SCA for inbred riceline 053001 when combined with three different RiceTec, Inc. inbred ricelines. These combinations show strong heterosis for grain yield overcheck line Cocodrie. For whole milling the check line had higher valuesthan any of the three combinations.

In Table 10 below, column 1 shows the hybrid crosses, column 2 shows theyield advantage in kilograms per hectare, column three shows the numberof locations, column 4 shows the probability as applied to the yieldadvantage, column 5 shows the whole milling percent advantage over thecheck and column 6 shows the number of years over which the data werecollected. TABLE 10 Yield Whole Ad- Milling vantage Locations AdvantageHybrid (kg/ha) (#) Probability (%) Years 054001*053001 2,460 302 0.000−2.5 4 054002*053001 3,348 89 0.000 −3.2 4 054003*053001 3,029 38 0.000−5.8 2

Deposit Information

A deposit of the rice seed of this invention is maintained by RiceTec,Inc., 1925 FM 2917, Alvin, Tex. 77511. Access to this deposit will beavailable during the pendency of this application to persons determinedby the Commissioner of Patents and Trademarks to be entitled theretounder 37 CFR 1.14 and 35 USC 122. Upon allowance of any claims in thisapplication, all restrictions on the availability to the public of theinbred line will be irrevocably removed by affording access to a depositof at least 2,500 seeds of the same inbred line with the American TypeCulture Collection, Manassas, Va.

While a number of exemplary aspects and embodiments have been discussedabove, those of skill in the art will recognize certain modifications,permutations, additions and sub-combinations thereof. It is thereforeintended that the following appended claims and claims hereafterintroduced are interpreted to include all such modifications,permutations, additions and sub-combinations as are within their truespirit and scope.

1. A seed of inbred rice line 053001, wherein a representative sample ofseed of said inbred rice line was deposited under ATCC Accession No.PTA-______.
 2. A rice plant, or a part thereof, produced by growing theseed of claim
 1. 3. A tissue culture of cells produced from the plant ofclaim 2, wherein said cells of the tissue culture are produced from aplant part selected from the group consisting of leaves, pollen,embryos, cotyledon, hypocotyl, meristematic cells, roots, root tips,pistils, anthers, flowers, stems, glumes and panicles.
 4. A protoplastproduced from the plant of claim 2
 5. A protoplast produced from thetissue culture of claim
 3. 6. A rice plant regenerated from the tissueculture of claim 3, wherein the plant has all the morphological andphysiological characteristics of inbred rice line
 053001. 7. A methodfor producing a hybrid rice seed, wherein the method comprises crossingthe plant of claim 2 with a different rice plant and harvesting theresultant hybrid rice seed.
 8. A hybrid rice seed produced by the methodof claim
 7. 9. A hybrid rice plant, or a part thereof, produced bygrowing said hybrid seed of claim
 8. 10. A method of producing anherbicide resistant rice plant wherein the method comprises transformingthe rice plant of claim 2 with a transgene wherein the transgene confersresistance to an herbicide selected from the group consisting ofimidazolinone, sulfonylurea, glyphosate, glufosinate,L-phosphinothricin, triazine and benzonitrile.
 11. An herbicideresistant rice plant produced by the method of claim
 10. 12. A method ofproducing an insect resistant rice plant wherein the method comprisestransforming the rice plant of claim 2 with a transgene that confersinsect resistance.
 13. An insect resistant rice plant produced by themethod of claim
 12. 14. The rice plant of claim 13, wherein thetransgene encodes a Bacillus thuringiensis endotoxin.
 15. A method ofproducing a disease resistant rice plant wherein the method comprisestransforming the rice plant of claim 2 with a transgene that confersdisease resistance.
 16. A disease resistant rice plant produced by themethod of claim
 15. 17. A method of producing a rice plant with modifiedfatty acid metabolism or modified carbohydrate metabolism wherein themethod comprises transforming the rice plant of claim 2 with a transgeneencoding a protein selected from the group consisting offructosyltransferase, levansucrase, alpha-amylase, invertase and starchbranching enzyme or encoding an antisense of stearyl-ACP desaturase. 18.A rice plant having modified fatty acid metabolism or modifiedcarbohydrate metabolism produced by the method of claim
 17. 19. A methodof introducing a desired trait into inbred rice line 053001 wherein themethod comprises: (a) crossing a 053001 plant, wherein a representativesample of seed was deposited under ATCC Accession No. PTA-______, with aplant of another rice line that comprises a desired trait to produceprogeny plants wherein the desired trait is selected from the groupconsisting of male sterility, herbicide resistance, insect resistance,modified fatty acid metabolism, modified carbohydrate metabolism andresistance to bacterial disease, fungal disease or viral disease; (b)selecting one or more progeny plants that have the desired trait toproduce selected progeny plants; (c) crossing the selected progenyplants with the 053001 plants to produce backcross progeny plants; (d)selecting for backcross progeny plants that have the desired trait andthe physiological and morphological characteristics of inbred rice line053001 to produce selected backcross progeny plants; and (e) repeatingsteps (c) and (d) three or more times to produce selected fourth orhigher backcross progeny plants that comprise the desired trait and allof the physiological and morphological characteristics of inbred riceline 053001 as listed in Table
 1. 20. A plant produced by the method ofclaim 19 wherein the plant has the desired trait and all of thephysiological and morphological characteristics of inbred rice line053001 as listed in Table
 1. 21. The plant of claim 20 wherein thedesired trait is herbicide resistance and the resistance is conferred toan herbicide selected from the group consisting of imidazolinone,sulfonylurea, glyphosate, glufosinate, L-phosphinothricin, triazine andbenzonitrile.
 22. The plant of claim 20 wherein the desired trait isinsect resistance and the insect resistance is conferred by a transgeneencoding a Bacillus thuringiensis endotoxin.
 23. The plant of claim 20wherein the desired trait is modified fatty acid metabolism or modifiedcarbohydrate metabolism and said desired trait is conferred by a nucleicacid encoding a protein selected from the group consisting offructosyltransferase, levansucrase, alpha-amylase, invertase and starchbranching enzyme or encoding an antisense of stearyl-ACP desaturase.